Team Rush Point of Waveform Closure Sponsored by

Team Rush Point of Waveform Closure Sponsored by: Schweitzer Engineering Laboratories, Inc.

Team Rush Point of Waveform Closure Team • Andrew King • Scott Henderson • Mentor: Normann Fischer (SEL) • Advisors: Joe Law, Richard Wall • Consultant: Jared Mraz

Team Rush Point of Waveform Closure Overview • • Purpose Need/Specs System Block Diagram Breakdown of Components Budget Plan/Schedule Priorities

Team Rush Point of Waveform Closure What’s the point? Transformer failure is expensive

Team Rush Point of Waveform Closure Need • Bank of power electronics switches • Energize at any point in the voltage waveform • Three phase capability

Team Rush Point of Waveform Closure Specifications • Microprocessor Control • Switches: withstand 400 A peak • Control three phases

Team Rush Point of Waveform Closure Specifications cont. • Zero detection circuit • System accuracy: within 500μs • Track voltage/current waveform Budget not to exceed $3000. 00

Team Rush Point of Waveform Closure Solution • Versatile microprocessor based system • Power electronics switches • Voltage and current monitoring

Team Rush Point of Waveform Closure Solution cont. • Modular for each phase – Less Risk – Ease of troubleshooting – More easily adaptable

Team Rush Point of Waveform Closure

Team Rush Point of Waveform Closure 0 Cross Detection • Methods Explored: – Op-Amp Circuit – Comparator Circuit – Detection Through Software

Team Rush Point of Waveform Closure 0 Cross Detection • Methods Explored: – Op-Amp Circuit • Effective in Testing • Accuracy within 100 -200μs

Team Rush Point of Waveform Closure 0 Cross Detection • Methods Explored: – Comparator Circuit • Less complicated than op-amp circuit • Accuracy reported to 1 -2μs • Will test in near future

Team Rush Point of Waveform Closure 0 Cross Detection • Methods Explored: – Detection Through Software • Could require significant processor resources • Build capability into processor, explore at a later date

Team Rush Point of Waveform Closure Microprocessor • Considered: – Rabbit – ARM – PSo. C • Best Choice: – PSo. C

Team Rush Point of Waveform Closure Microprocessor • PSo. C – Capture and Compare – Flexible – Cheap • Modularization • Limited Risk • Several available for experimentation

Team Rush Point of Waveform Closure PSo. C • Programmable System On Chip – Mfg. by Cypress Semiconductor – Mixed signal array • 8 -bit M 8 C microprocessor • 24 MHz clock speed • Analog and digital peripherals – Constructed based upon needs • Building block architecture • Programmed with C

Team Rush Point of Waveform Closure Switching Device • Considered: – Triac – Thyristor(SCR) – SCR Modules • Best Choice: – IXYS SCR Module MCC-220

Team Rush Point of Waveform Closure Switching Device • IXYS SCR Module MCC-220 – Cheap – Back to back package – Easy to mount – Price: $136 each

Team Rush Point of Waveform Closure SCR Gate Driver • Considered: – Enerpro – Applied Power Systems – Build it ourselves • Best Choice: – Enerpro--Single Phase SCR Firing Board

Team Rush Point of Waveform Closure SCR Gate Driver • Enerpro--Single Phase SCR Firing Board – Don’t have to build anything – Fires two SCRs – Possible source for 0 cross detection – Instantaneous Inhibit/Enable – Price: $269 each

Team Rush Point of Waveform Closure Heatsink • Considered: – Purchase – Non-utilized heat sink belonging to the U of I • Best Choice: – Non-utilized heat sink • Slightly oversized but will work • Price: Free

Team Rush Point of Waveform Closure Mechanical Contactor • Cutler Hammer C 25 FNE 350 A – 3 Pole 50 A contactor – 110 -120 V AC Coil – Price: appx. $200. 00

Team Rush Point of Waveform Closure Current Measurement • LEM HTFS 400 -P/SP 2 • Isolated/Hall effect device • Price: $47. 00 each

Team Rush Point of Waveform Closure Voltage Measurement • LEM CV 3 -500 • Closed loop voltage transducer • Price: currently unknown, approx. $70. 00

Team Rush Point of Waveform Closure PCBs • Two per Phase – Board 1 --Processor/0 cross detect – Board 2—Sensor/Sensor Support • Price: Appx. $800

Team Rush Point of Waveform Closure Budget – Initial Budget • • SCRs (3) SCR Driver Boards (3) Contactor (1) Microprocessors (3) PCBs (6) Current Transducers (3) Voltage Measurement (3) Miscellaneous Equipment – Total – Amount Over Budget $3000 $408 $810 $200 $450 $800 $150 $210 $100 $3128 $128

Team Rush Point of Waveform Closure Plan/Schedule • Remainder of First Semester – Order all purchasable components* – Work with loaner PSo. C processor – Construct SCR/Driver/Contactor – Continue work on 0 cross detection

Team Rush Point of Waveform Closure Plan/Schedule • Second Semester – Design/Build integrated PCBs – Integrate Microprocessor – Complete/Test entire system – Write paper for WCPRC

Team Rush Point of Waveform Closure Priorities (In order of importance) • • • 1) Single phase switch 2) Priority 1— 3 phase 3) Testing 4) Voltage/current monitoring 5) Residual flux measurement

Team Rush Point of Waveform Closure Any Questions? Andy King andrewking@vandals. uidaho. edu Scott Henderson scott. henderson@vandals. uidaho. edu http: //seniordesign. engr. uidaho. edu/2007_2008/rush/